Thanks for the reponses. If I wouldn't have found an obituary for my emigrant Schneider ancestor it would have been a real bugger to find out which town they were in from Germany (especially for those that emigrated in the massive wave of 1854-1856). I have also come to find out that sometimes in Church records it may say the place of origin as well.
A reminder to anyone with decendants from the Trier and surrounding area of Germany should check out the Useful link a few posts above. It may some help find a few more ancestors.